The GCF is 1.
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The GCF of 1 and 91 is 1. The GCF of 91 and 91 is 91.
GCF(83, 100) = 1. The numbers are coprime.
The GCF of 28, 84, and 91 is 7.
The GCF of 35, 49, and 91 is 7.
Since 13 is a factor of 91, it is automatically the GCF.